CN106838401A

CN106838401A - Valve gear

Info

Publication number: CN106838401A
Application number: CN201610994327.4A
Authority: CN
Inventors: 山口弘晴
Original assignee: Piolax Inc
Current assignee: Piolax Inc
Priority date: 2015-11-12
Filing date: 2016-11-11
Publication date: 2017-06-13
Anticipated expiration: 2036-11-11
Also published as: US10221955B2; US20170138493A1; JP6578585B2; GB2546363A; CN106838401B; GB2546363B; JP2017089789A

Abstract

A kind of valve gear of the response when present invention provides inclination for suppressing positive pressing spring and improves valve opening.The valve gear (10) possesses：Valve chest (15), it is provided with valve chamber (V) and valve seat (26)；Valve body (40), it has the sealing (41) for valve seat (26) contact/separate and the peripheral part (50) for extending configuration with specific length along the inner circumferential of valve chamber V；And positive pressing spring (S1), valve body (40) is carried out pretension by it to the valve seat (26) of valve chest (15), peripheral part (50) in valve body (40) is formed with multiple opening portions (55), the plurality of opening portion circumferentially portion (50) it is axially extending, and configure at predetermined intervals in the circumferential, the inner circumferential of the valve chamber (V) of valve chest (15) is provided with flank (28), the flank (28) is configured to, protruded towards the internal diameter direction of valve chest (15), from each opening portion (55) of valve body (40) through and limit moving radially for positive pressing spring (S1).

Description

Valve gear

Technical field

The present invention relates to a kind of valve gear, the valve gear is installed on the fuel tank of automobile etc., is used as check valve etc..

Background technology

Generally, the fuel tank in automobile etc. is provided with check valve, and pressure of the check valve in fuel tank rises to and is more than Or during equal to setting, fuel vapo(u)r is flowed out to outside prevents rupture of fuel tank etc., in the fuel compared with external pressure Pressure in case is deteriorated to less than or during equal to setting, extraneous gas is flowed into from outside fuel tank and is prevented damaging by pressure for fuel tank Deng.

Currently, as this check valve, a kind of check valve has been recorded in following patent documents 1, the check valve is configured to Possess：Housing body, it internally has malleation valve seat；Sub-shell；Positive valve, it has negative pressure valve seat；And negative pressure valve, its The malleation valve seat is assembled in, being configured between positive valve and sub-shell, positive valve is carried out the malleation bullet of pretension to malleation valve seat Spring, positive valve leaves when fuel tank internal pressure is more than or equal to setting from malleation valve seat, and negative pressure valve is less than in fuel tank internal pressure Or left from negative pressure valve seat during equal to setting

The positive valve turns into the degree for covering the substantially complete cycle of the positive pressing spring tubular that stretches out of ground more long, in it Protrude in week and be provided with spring holding rib.And, for the positive pressing spring, base end side is supported on sub-shell, front insertion Prescribed limit is kept using spring holding rib from front end in positive valve, is maintained so that positive pressing spring will not incline Tiltedly.

Patent document 1：International Publication WO2010/064475 pamphlets

In check valve, it is configured to positive valve and is slided in valve chest and touch/separated with positive valve seated connection, but in order to accurate Pressure when ground control positive valve touch/is separated with positive valve seated connection is, it is necessary to be configured so that positive pressing spring relative to valve chest Axle center does not incline.Its reason is that, if positive pressing spring is inclined, its pretightning force can change.

However, in the case of the check valve of above-mentioned patent document 1, as noted previously, as positive pressing spring from front end Prescribed limit is played to be inserted into the inner circumferential of positive valve and kept using spring holding rib, so if positive valve is inclined, then Can also be inclined with its positive pressing spring that accompanies, it is possible to which response during to valve opening produces obstruction.

The content of the invention

Therefore, it is an object of the invention to provide a kind of valve gear, the valve gear can suppress the inclination of positive pressing spring and Improve response when opening valve body.

To achieve these goals, valve gear of the invention is characterised by possessing：Valve chest, it is formed side at one end Have the 1st communication port connected with fuel tank, be formed with the 2nd communication port connected with outside fuel tank in another side, it is internal into It is valve chamber, and the opening portion connected with the 1st communication port is provided with valve seat；Valve body, it matches somebody with somebody in the valve chamber of the valve chest It is set to slidably, and it is with the sealing for contacting/being separate with the valve seat and long with regulation along the inner circumferential of the valve chamber Degree extends the peripheral part of configuration；And positive pressing spring, the inner side of its peripheral part for being inserted into the valve body, one end and the valve body Abut, the other end is configured to be abutted with the another side of the valve chest, and the positive pressing spring is by the valve body to the valve casing The valve seat of body carries out pretension, and multiple opening portions are formed with the peripheral part of the valve body, and the plurality of opening portion is along the peripheral part It is axially extending, and configure at predetermined intervals in the circumferential, the inner circumferential of the valve chamber of the valve chest is provided with flank, the flank It is configured to, is protruded towards the internal diameter direction of the valve chest, the malleation bullet is passed through and limited from each opening portion of the valve body Spring is moved radially.

In valve gear of the invention, preferably described flank is arranged at the motion track of a side of the positive pressing spring The scope of covering.

In valve gear of the invention, preferred to the axle center for causing the valve body and the axle center phase of the positive pressing spring Axle center for the valve chest is in same heart shaped, is configured to, and will be configured with the state of the valve body and the positive pressing spring Under the valve chest inner circumferential and the gap of the periphery of the valve body be set to A, by the protrusion direction end face of the flank and institute When the gap for stating the periphery of positive pressing spring is set to B, as A ＞ B.

In valve gear of the invention, the valve body is preferably provided with insertion path, the insertion path with it is described The opening of fuel tank side connection is provided with negative pressure valve seat, and be mounted slidably in the insertion path is carried out to the negative pressure valve seat The negative pressure valve of opening and closing, the negative pressure spring that the negative pressure valve is configured in the valve body is pre- to the direction for closing the negative pressure valve seat Tightly, in the inner side of the part for configuring the positive pressing spring of the valve body, the valve body is provided with guiding wall, this draws Guide wall is guided to the periphery of the negative pressure spring, in order that obtaining the axle center of the valve body and the axle center of the positive pressing spring Axle center relative to the valve chest is in same heart shaped, is configured to, and will be configured with the shape of the valve body and the positive pressing spring When the inner circumferential of the described positive pressing spring under state is set to C with the gap of the periphery of the guiding wall, as A-B ＜ C.

The effect of invention

Valve gear of the invention, due to being configured to, sets multiple opening portions, from valve chest in the peripheral part of valve body Valve chamber inner circumferential is passed through from each opening portion of valve body and limits moving radially for positive pressing spring towards the flank that internal diameter direction protrudes, because Even if this is inclined in valve chamber inner valve body, it is also possible to which the flank set using the valve chest in the obliquity effects for not receiving valve body is suppressed just The inclination of pressing spring, as a result, the variation of the pretightning force of positive pressing spring can be suppressed and response when valve body is opened is improved, will Valve body is accurately opened with the cracking pressure for specifying.

Brief description of the drawings

Fig. 1 is an exploded perspective view for implementation method for representing valve gear of the present invention.

Fig. 2 is in the valve gear, the housing body of valve chest to be looked side ways along in the case of slit shearing, part section Figure.

Fig. 3 is the transverse sectional view of the valve gear.

Fig. 4 be in the valve gear along Fig. 3 sectional view from E-E to sight line.

Fig. 5 is the oblique view of the valve body for constituting the valve gear.

Fig. 6 is the sectional view of the valve body and negative pressure valve for constituting the valve gear.

Fig. 7 is in the valve gear, by the housing body of valve chest along in the case of the transversely cutting for specifying, partial cutaway Face oblique view.

Fig. 8 is represented in the valve gear, and the pressure in fuel tank wants portion as the state more than or equal to setting Amplification view.

Fig. 9 is represented in the valve gear, is turned into less than or equal to regulation relative to the pressure in external pressure fuel tank The enlarged view of a portion of the state of the negative pressure of value.

The explanation of label

10 valve gears

15 valve chests

20 housing bodies

23 opening portions

24 the 1st connecting portions

25 the 1st communication ports

26 valve seats

28 flanks

30 sub-shells

32 opening portions

34 the 2nd connecting portions

35 the 2nd communication ports

40 valve bodies

41 sealings

43 insertion paths

45 negative pressure valve seats

48 guiding walls

50 peripheral parts

55 opening portions

60 negative pressure valves

61 main bodys

65 lids

The positive pressing springs of S1

S2 negative pressure springs

V valve chambers

Specific embodiment

Below, an implementation method referring to the drawings to valve gear of the invention is illustrated.

As shown in Figure 1 and Figure 2, the valve gear 10 of present embodiment possesses：Valve chest 15, its at one end side be formed with 1st communication port 25 of connection in fuel tank, is formed with the 2nd communication port 35 connect with outside fuel tank in another side, inside into It is valve chamber V, and the opening portion 23 connected with the 1st communication port 25 is provided with valve seat 26；Valve body 40, it is slideably configured at The valve chamber V of the valve chest 15, with negative pressure valve seat 45；Positive pressing spring S1, it enters the valve body 40 to the valve seat 26 of valve chest 15 Row pretension；Negative pressure valve 60, it is slideably assembled in the valve body 40 and is made up of main body 61 and lid 65；And negative pressure bullet Spring S2, the negative pressure valve 60 is carried out pretension by it along to the direction for closing negative pressure valve seat 45.

First, valve chest 15 is illustrated.The valve chest 15 has：Housing body 20；And be assembled in the housing body 20 and Form the sub-shell 30 of the valve chamber V.

The housing body 20 has substantially cylindric perisporium 21 and the ceiling portion configured in a side of the perisporium 21 22.The opening portion 23 connected with valve chamber V is formed with the center in the ceiling portion 22, is extended from the surface periphery of the opening portion 23 and is set The 1st connecting portion 24 is equipped with, one end of the 1st connecting portion 24 turns into the 1st communication port 25.The 1st connecting portion 24 connection with The pipe arrangement (not shown) of fuel tank connection.

In addition, the inside periphery protrusion from the opening portion 23 in the ceiling portion 22 is provided with cylindrical valve seat 26, valve The sealing described later 41 of body 40 is contacted/separated and is opened and closed (reference picture 4, Fig. 8 and figure to opening portion 23 with the valve seat 26 9)。

Additionally, the valve seat 26 of present embodiment is set from the inside periphery protrusion of opening portion 23, but it is also possible to from opening The place of positioning away from of portion 23 set valve seat 26, as long as the sealing 41 of valve body 40 contacted with valve seat 26/separated and can be to opening Portion 23 is opened and closed.Also, the opening periphery of the base end side from the perisporium 21 is extended to have and is carried out with sub-shell 30 The used annular flange portion 27 of assembling.

In addition, being provided with flank 28 from the inner circumferential of valve chamber V, for the flank 28, opened with the described later of valve body 40 is arranged at The relation of oral area 55 is illustrated below.

On the other hand, sub-shell 30 has discoid lid 31, and the lid 31 has been formed centrally opening portion 32 wherein, from The outer surface side periphery of the opening portion 32 is extended the 2nd connecting portion 34 of tubular, in the front of the 2nd connecting portion 34 (i.e., The another side of valve chest 15) it is formed with the 2nd communication port 35.The peripheral part of the lid 31 is by welding etc. and housing body 20 annular flange portion 27 is engaged, and sub-shell 30 thus is assembled in into housing body 20.In addition, from the opening portion 32 of lid 31 Surface periphery protrudes the spring support seat 33 for being provided with the ring-type that the one end for aligning pressing spring S1 is supported.Additionally, described The pipe arrangement (not shown) that connection is connected with the gas tank of the exterior arrangement in fuel tank at 2nd connecting portion 34.

Below, reference picture 3~5 and illustrate valve body 40.The valve body 40 of present embodiment cooperates with dynamic with negative pressure valve described later 60 Make and worked as positive valve.The valve body 40 has：Substantially discoideus sealing 41；And peripheral part 50, it is along described The inner circumferential of valve chamber V and with specific length extend configure, on the inside of it insertion be configured with positive pressing spring S1.

Through hole is centrally formed with the sealing 41, being extended from the inside periphery of through hole has cylindrical wall 46, the inner chamber of the cylindrical wall turns into insertion path 43.After the insertion path 43 is slidably inserted into and is configured with negative pressure valve 60 The main body 61 stated.In addition, in the inside side of sealing 41, the base end side peripheral part of cylindrical wall 46 turns into negative pressure spring S2 one The part (reference picture 4) that end abuts and is supported.Also, in the opening connected with fuel tank side in the insertion path 43 Surface periphery protrusion is provided with the negative pressure valve seat 45 of ring-type.

In addition, as shown in FIG. 4 and 5, the inner circumferential from cylindrical wall 46 is axially disposed in the way of decile in the circumferential There are multiple ribs 47, ribs 47 turn into the part slidably supported to the main body 61 of negative pressure valve 60.

Also, the inner side of the peripheral part 50 in the positive pressing spring S1 of configuration of valve body 40, the periphery to negative pressure spring S2 is carried out The guiding wall 48 of guiding is integrally provided with valve body 40.Here, in the inside side of sealing 41, the inner side of peripheral part 50 and The periphery of the cylindrical wall 46, cylindrical guiding wall 48 is arranged with respect to the same heart shaped of cylindrical wall 46 with specific length.

In addition, the peripheral part 50 in valve body 40 is formed with multiple opening portions 55, the circumferentially portion 50 of the plurality of opening portion 55 It is axially extending, and configure at predetermined intervals in the circumferential.In the present embodiment, formed in the following manner.

That is, in the periphery in discoideus sealing 41, multiple lugs 51 are in the circumferential across impartial interval to put Penetrate shape protrusion to set, link the columnar part 52 stretched out along the axial direction of valve body 40 respectively in each lug 51, and in each columnar part 52 base end part (from the end that sealing 41 leaves) links the linking part 53 of ring-type, thus constitutes peripheral part 50.

And, between columnar part 52,52 adjacent in the circumferential, the circumferentially axial direction in portion 50 and the shape of opening portion 55 that extends Connected as the inner space with valve body 40, the opening portion 55 configures multiple at predetermined intervals in the circumferential.In addition, in peripheral part 50 inner side insertion is configured with positive pressing spring S1, by setting multiple opening portions 55, so that positive pressing spring S1 reveals from valve body periphery Go out.

Additionally, each lug 51 turns into the part (reference for abutting and being supported with one end of the positive pressing spring S1 Fig. 4).Also, as shown in Fig. 3 and Fig. 5, for each columnar part 52, its outer peripheral face is in arc-shaped, and inner peripheral surface is in flat post Shape.In addition, in the present embodiment, the leading section 52a of each columnar part 52 is with the surface (negative pressure valve seat 45 than the sealing 41 Formation face) mode high protrudes, leading section 52a is entered in the perisporium 21 of housing body 20, ceiling portion 22 and valve seat 26 Between the small space that is formed, improve the guiding effect of the slip of valve body 40, but leading section 52a without certain higher than sealing surface Ground protrusion.Also, cylindrical wall 46 and guiding wall 48 that the base end part side of each columnar part 52 extends with the back side from sealing 41 Compare, extend longer.

In addition, the lug 51 of present embodiment, columnar part 52 and opening portion 55 are respectively arranged with 8, but it is not special Ground is limited, preferably greater than or equal to 3, more preferably equal to or greater than 6.

Additionally, the peripheral part 50 of present embodiment is by the multiple columnar parts 52, the cardinal extremity by columnar part 52 that axially extend Portion links for the linking part 53 of ring-type is formed as the shape (reference as cage with the multiple opening portions 55 for axially extending Fig. 5), but it is not limited to the shape.For example, the cylindrical wall axially extended from the periphery edge of sealing 41 is set, at this Cylindrical wall, sets multiple opening portions 55 for axially extending, it is also possible to be referred to as " peripheral part " in the circumferential.

In addition, carrying out the positive pressing spring S1 of pretension to valve body 40 as shown in Figure 4, its other end is by the sub-shell 30 Spring support seat 33 support, and one end is inserted into the inner side of the peripheral part 50 of valve body 40 and abuts and receive with multiple lugs 51 To support, in valve chest 15, with compressive state configuration between the lid 31 and valve body 40 of sub-shell 30.As a result, valve body 40 is to be abutted with the valve seat 26 of valve chest 15 by pretension, and the sealing 41 of valve body 40 abuts (reference picture 4) with valve seat 26 all the time.And And, if the pressure in fuel tank rises to presses valve body 40, the malleation more than or equal to setting using fuel vapo(u)r Spring S1 is compressed, and thus, valve body 40 is slided in valve chamber V and causes that sealing 41 leaves from valve seat 26, and opening portion 23 is opened (reference picture 8).

Additionally, as shown in figure 4, in the present embodiment, positive pressing spring S1 is configured to, at one end by the lug 51 of valve body 40 In the state of support, its external diameter is slightly larger compared with the external diameter of the sealing 41 of valve body 40, but the external diameter of positive pressing spring S1 can also It is set smaller than or equal to the external diameter of sealing 41.

Below, it is assembled in being made up of main body 61 and lid 65 and slideably the negative pressure valve 60 of the valve body 40 and carries out Explanation.Additionally, non-existent mode can also be set to for the negative pressure valve 60.In this case, insertion path 43 is not provided with, if For the shape that sealing 41 is blocked for.

As shown in Fig. 1, Fig. 4 and Fig. 6, the main body 61 of negative pressure valve 60 is inserted into the valve in the shape extended with column Supported as slidably by the ribs 47 of valve body 40 in the insertion path 43 of body 40.In addition, the base end part in main body 61 is set Have the valve head 62 of umbrella, the valve head 62 be used for contact/separate with the negative pressure valve seat 45 of valve body 40 and to the fuel in insertion path 43 Case side opening is opened and closed.Also, it is formed with the engaging portion 63 of ring-type in the leading section side of main body 61.

On the other hand, lid 65 is provided with to negative pressure spring in the tubular of acceptance subject 61 in the cardinal extremity periphery protrusion of lid 65 The spring base 66 that the other end of S2 is supported.In addition, as shown in fig. 6, being provided with and the main body 61 from the inner circumferential of lid 65 A pair of engagement pawl 67,67 of the locking of engaging portion 63.Also, in the cardinal extremity side opening of lid 65, erection has the front end to main body 61 The support chip 68 (reference picture 4) that portion is supported.

And, the other end of negative pressure spring S2 is supported using spring base 66, and make one end of negative pressure spring S2 The base end side peripheral part of the cylindrical wall 46 of valve body 40 is supported in, main body 61 is inserted into the insertion path 43 of valve body 40, make lid 65 A pair of engagement pawl 67,67 be locked to the engaging portion 63, thus, it is possible to by negative pressure spring S2 compress in the state of, relative to Be assembled into negative pressure valve 60 slidably (reference picture 6) by valve body 40.Additionally, in this condition, using the pretightning force of negative pressure spring S2, Negative pressure valve 60 is carried out into pretension to by the direction that the negative pressure valve seat 45 of valve body 40 is closed so that the valve head 62 of main body 61 all the time with it is negative Pressure valve seat 45 abuts (reference picture 4).

And, the pressure in the fuel tank compared with external pressure is deteriorated to less than or during equal to setting, negative pressure valve 60 Pressed by extraneous gas, resist the pretightning force of negative pressure spring S2 and carry out sliding action, the valve of negative pressure valve 60 relative to valve body 40 First 62 leave (reference picture 9) from the negative pressure valve seat 45 of valve body 40.As a result, extraneous gas outside from fuel tank is from valve body 40 Insertion path 43 by and between valve head 62 and negative pressure valve seat 45 flow out, via opening portion 23 in the 1st connecting portion 24 flow Dynamic (reference picture 9).

Below, the flank 28 that narration is set in the inner circumferential of the valve chamber V of valve chest 15 in detail.That is, such as Fig. 2~4 and Fig. 7 institutes Show, flank 28 is set to, protruded towards the internal diameter direction of valve chest 15 from the inner circumferential of the valve chamber V of valve chest 15, from the valve body 40 each opening portion 55 passes through and limits moving radially for positive pressing spring S1.

The flank 28 of present embodiment is in thin-walled tabular, from the inner peripheral surface of the perisporium 21 of housing body 20 towards valve chest 15 Axle center G1 (reference picture 3), protrude with separating predetermined distance and be provided with multiple.

In addition, for each flank 28, one end links with the ceiling portion 22 of housing body 20, along the axial direction of valve chest 15 (reference picture 2 and Fig. 4) is extended with specific length.In the present embodiment, each flank 28 is arranged at least is carried out valve body 40 The scope of the motion track L coverings of one side (the abutting part side with valve body 40) of positive pressing spring S1 during slip, to cause valve The state (reference picture 4) that the sealing 41 of body 40 is abutted from the sealing 41 with the valve seat 26 of valve chest 15 can from valve seat 26 from Open (reference picture 8).In addition, the inner surface side in the base end part of each flank 28 is formed with taper surface 28a, it is difficult to be hooked on malleation bullet At the wire rod of spring S1.

In addition, as shown in figure 4, the flank 28 connects relative to the periphery of the sealing 41 of valve body 40 across small gap Nearly configuration, and be configured to periphery relative to positive pressing spring S1 also close to.Additionally, flank 28 is preferably at least relative to valve body 40 Sealing 41 and close to configuration, relative to the position in addition to sealing 41 of valve body 40, not only can be close to configuration but also can be with Keep off configuration.If so, the appearance of the valve body 40 when then can easily maintain the sealing 41 of valve body 40 to be abutted with valve seat 26 State, improves sealing.

And as shown in figure 3, in order that the axle center G3 of the axle center G2 and positive pressing spring S1 of valve body 40 is obtained relative to valve casing The axle center G1 of body 15 is in same heart shaped, is configured to, by the valve chest 15 in the state of valve body 40 and positive pressing spring S1 is configured with Inner circumferential and valve body 40 periphery gap be set to A (here for housing body 20 perisporium 21 inner circumferential and valve body 40 column The gap of the outer peripheral face in portion 52), when the protrusion direction end face of flank 28 is set into B with the gap of the periphery of positive pressing spring S1, into It is A ＞ B.

In addition, being configured in the present embodiment, the setting relation due to negative pressure valve 60 relative to valve body 40, following relation Also set up.I.e., in the same manner as described above, in order that obtaining the axle center G3 of the axle center G2 and positive pressing spring S1 of valve body 40 relative to valve casing The axle center G1 of body 15 is in same heart shaped, is configured to, the positive pressing spring in the state of it will be configured with valve body 40 and positive pressing spring S1 When the inner circumferential of S1 is set to C with the gap of the periphery of the guiding wall 48 of valve body 40, as A-B ＜ C (reference picture 3).

Additionally, the quantity that the flank 28 of present embodiment is matched with the opening portion 55 with the valve body 40 (is 8 here It is individual) it is configured, each flank 28 is inserted into each opening portion 55 of valve body 40 respectively, therefore, it is possible to realize valve body 40 relative to valve Housing 15 it is rotationally constrained.In addition, the number of flank 28 is not particularly limited, preferably greater than or equal to 3, more preferably greater than or Equal to 6.

Below, the action effect of the valve gear of the invention 10 to being made up of said structure is illustrated.

For example, for the valve gear 10, stop valve in fuel tank etc. is connected with and is configured at even in its 1st connecting portion 24 The pipe arrangement of knot and the 2nd connecting portion 34 are connected with and are configured in the state of the pipe arrangements of link such as the gas tank outside fuel tank, using not Fixture, bracket of diagram etc. and be configured in fuel tank or outside fuel tank.

And, in the case that the pressure in fuel tank is less than or equal to setting, as shown in figure 4, turn into following states, That is, abutted and opening portion 23 with the valve seat 26 of valve chest 15 by the sealing 41 of the valve body 40 of the pretightning force pretension of positive pressing spring S1 It is blocked for, and is abutted with the negative pressure valve seat 45 of valve body 40 by the valve head 62 of the negative pressure valve 60 of the pretightning force pretension of negative pressure spring S2 And the insertion path 43 of valve body 40 is blocked for.

In the above-described state, if the pressure in fuel tank is risen to more than or equal to setting, fuel vapo(u)r etc. from In 1st connecting portion 24 by and to be flowed out from opening portion 23, valve body 40 is pressed, as shown in figure 8, the overall resistance malleation bullet of valve body 40 Spring S1 and slided to the side of the 2nd connecting portion 34 (side of sub-shell 30) of valve chest 15, the sealing 41 of valve body 40 is from valve chest 15 Valve seat 26 leaves and opens opening portion 23.So, as indicated by the arrows in fig. 8, fuel vapo(u)r can be in the inner circumferential of housing body 20 Flowed and the periphery of valve body 40 between, and from the opening portion 55 of valve body 40 by and flow into the opening portion 32 of sub-shell 30 It is interior, it is fed through gas tank etc. via the pipe arrangement interior and (not shown) of the 2nd connecting portion 34 and is expelled to outside fuel tank, make in fuel tank Pressure reduction.

When valve body 40 is slided in valve chest 15, predetermined distance is provided between valve body 40 and the inner circumferential of valve chest 15 Gap A (reference picture 3), therefore valve body 40 can be inclined sometimes.But, in the valve gear 10, even if valve body 40 is inclined, it is also possible to Cracking pressure when valve body 40 is opened is maintained constant, improves response.

That is, in the valve gear 10, due to being configured to as Fig. 2~4 and Fig. 7, set in the peripheral part 50 of valve body 40 Multiple opening portions 55 are put, the flank 28 protruded towards internal diameter direction from the valve chamber inner circumferential of valve chest 15 is from each opening portion of valve body 40 55 pass through and limit moving radially for positive pressing spring S1, even if therefore inclined in valve chamber inner valve body 40, it is also possible to using not receiving Flank 28 that the valve chest 15 of the obliquity effects of valve body 40 is set and suppress the inclination of positive pressing spring S1.Therefore, it is possible to suppress just The variation of the pretightning force of pressing spring S1 and improve valve body 40 open when response, can by valve body 40 with specify cracking pressure Accurately smoothly open (reference picture 8).

In addition, in the present embodiment, as shown in figure 8, because each flank 28 is arranged at a side of positive pressing spring S1 Motion track L coverings scope, therefore can at least suppress the inclination of a side of positive pressing spring S1 and effectively suppress just The inclination of pressing spring S1.

Also, in the present embodiment, as shown in figure 3, in order that obtaining the axle center G2's and positive pressing spring S1 of valve body 40 Axle center G3 is in same heart shaped relative to the axle center G1 of valve chest 15, is configured to, and will be configured with valve body 40 and positive pressing spring S1 The inner circumferential of the valve chest 15 under state is set to A, protrusion direction end face and malleation by flank 28 with the gap of the periphery of valve body 40 When the gap of the periphery of spring S1 is set to B, as A ＞ B.So, by setting the relation of A and B, even if so that valve body 40 is in valve Interior is greatly inclined, and positive pressing spring S1 is not easy to by the obliquity effects of valve body 40, can more effectively suppress malleation bullet The inclination of spring S1.

In addition, in the present embodiment, as shown in figure 3, in order that obtaining the axle center G2's and positive pressing spring S1 of valve body 40 Axle center G3 is in same heart shaped relative to the axle center G1 of valve chest 15, is configured to, and will be configured with valve body 40 and positive pressing spring S1 When the inner circumferential of the positive pressing spring S1 under state is set to C with the gap of the periphery of the guiding wall 48 of valve body 40, as A-B ＜ C.This Sample, by setting the relation of A, B, C, even if so that as assembling negative pressure valve 60 and negative pressure spring S2 and in valve in valve body 40 In the case that body 40 is provided with the construction of the guiding wall 48 guided to the periphery of negative pressure spring S2, when valve body 40 is inclined, Also the inclination of positive pressing spring S1 can be suppressed using the flank 28 of valve chest 15, without influence guiding wall 48.

On the other hand, if the pressure relative to external pressure in fuel tank is deteriorated to less than or equal to setting, As shown in figure 9, extraneous gas is imported via in the 2nd connecting portion 34 of sub-shell 30 and from opening portion 32 to valve chamber V, outside this Gas between the engagement pawl 67 of lid 65 and valve body 40 internal flow, press umbrella valve head 62.So, negative pressure valve seat 45 dozens Open, therefore, extraneous gas can be flowed into the 1st connecting portion 24 from opening portion 23 and be fed through combustion via pipe arrangement (not shown) In hopper, the pressure in fuel tank is set to increase.Additionally, in fig .9, in order to illustrate leading for extraneous gas in understandable mode Enter path, cause that the profile direction of lid 65 is different relative to the negative pressure valve seat 45 of Fig. 4 and Fig. 8 for convenience.

Additionally, for the valve gear 10 of above-mentioned implementation method, negative pressure valve 60 is also set up on the basis of valve body 40, as with The so-called check valve that is adjusted in the pressure to fuel tank internal pressure and work, but it is also possible to only valve body 40 and be not provided with bearing The construction of pressure valve 60, and be not specially limited.

In addition, the present invention is not limited to above-mentioned implementation method, in the range of purport of the invention, exist various Variant embodiment, such implementation method is also included within the scope of the present invention.

Claims

1. a kind of valve gear, it is characterised in that possess：

Valve chest, it is formed with the 1st communication port connected with fuel tank in side, is formed with and fuel tank in another side at one end 2nd communication port of outer connection, inside turns into valve chamber, and the opening portion connected with the 1st communication port is provided with valve seat；

Valve body, it is configured to slidably in the valve chamber of the valve chest, and with the sealing for contacting/being separate with the valve seat, And extend the peripheral part of configuration with specific length along the inner circumferential of the valve chamber；And

Positive pressing spring, the inner side of its peripheral part for being inserted into the valve body, one end abuts with the valve body, the other end be configured to The another side of the valve chest is abutted, and the valve body is carried out pretension by the positive pressing spring to the valve seat of the valve chest,

Be formed with multiple opening portions in the peripheral part of the valve body, the plurality of opening portion along the axially extending of the peripheral part, and Configure at predetermined intervals in the circumferential,

The inner circumferential of the valve chamber of the valve chest is provided with flank, the flank is configured to, towards the internal diameter direction of the valve chest Protrusion, passes through from each opening portion of the valve body and limits moving radially for the positive pressing spring.

2. valve gear according to claim 1, wherein,

The flank is arranged at the scope for covering the motion track of a side of the positive pressing spring.

3. valve gear according to claim 1 and 2, wherein,

In order that obtaining the axle center of the axle center of the valve body and the axle center of the positive pressing spring relative to the valve chest in concentric Shape, is configured to, the inner circumferential of the valve chest in the state of it will be configured with the valve body and the positive pressing spring with it is described The gap of the periphery of valve body is set to A, the protrusion direction end face of the flank is set into B with the gap of the periphery of the positive pressing spring When, as A ＞ B.

4. valve gear according to claim 3, wherein,

The valve body is provided with insertion path, the opening connected with the fuel tank side in the insertion path is provided with negative pressure Valve seat,

The negative pressure valve being opened and closed to the negative pressure valve seat is slideably configured in the insertion path, the negative pressure valve is by described The negative pressure spring of configuration is to the direction pretension for closing the negative pressure valve seat in valve body,

In the inner side of the part of the configuration positive pressing spring of the valve body, the valve body is provided with guiding wall, should Guiding wall is guided to the periphery of the negative pressure spring,

In order that obtaining the axle center of the axle center of the valve body and the axle center of the positive pressing spring relative to the valve chest in concentric Shape, is configured to, the inner circumferential of the described positive pressing spring in the state of it will be configured with the valve body and the positive pressing spring and institute When the gap for stating the periphery of guiding wall is set to C, as A-B ＜ C.